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TM 9-2320-364-20-2
2-1792
6. PARKING BRAKES ON AXLES NO. 4 AND NO. 5 DO NOT APPLY (CONT).
Brakes on Axle No. 3 operate
correctly.
All parking brakes on Axles
No. 4 and No. 5 fail to apply.
Air lines OK.
Relay spring valve No. 2 OK.
Air chambers OK.
Brakes faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Visual inspection.
If brake components are faulty
or installed incorrectly, they will
prevent parking brakes from
applying.
YES
NO
Replace brake shoes
and/or wedges
(Para 12-2).
Verify repair, go to
Step 6 of this Fault.
5.
Are brake shoes and wedges
free of damage?
4.
Does air chamber operate
correctly?
Replace air chamber
(Para 12-10).
Verify repair, go to
Step 6 of this Fault.
YES
NO
Brakes on Axle No. 3 operate
correctly.
All parking brakes on Axles
No. 4 and No. 5 fail to apply.
Air lines OK.
Relay spring valve No. 2 OK.
Air chambers faulty.
Brakes faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Operation test.
If air chamber rods bind as they
travel in chambers, they will not
permit parking brake to apply.
WARNING
WARNING
Read WARNING
on Page 2-1793
Read WARNING
on Page 2-1793
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